Inmate-on-inmate victimization rates were examined through official and self-report data. We checked prison records of 219 male inmates from a prison in Portugal, and estimated rates of official inmate-on- inmate victimization during a 12-month period. Of these 219 inmates, 108 agreed to participate in a self-report survey on their inmate-on- inmate victimization experiences in the last 12 months. According to ...